381756393 has 12 divisors (see below), whose sum is σ = 551598528. Its totient is φ = 254424600.

The previous prime is 381756383. The next prime is 381756407. The reversal of 381756393 is 393657183.

381756393 is a `hidden beast` number, since 3 + 8 + 1 + 7 + 5 + 639 + 3 = 666.

It is not a de Polignac number, because 381756393 - 2⁶ = 381756329 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (381756313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44196 + ... + 52122.

It is an arithmetic number, because the mean of its divisors is an integer number (45966544).

Almost surely, 2^381756393 is an apocalyptic number.

It is an amenable number.

381756393 is a deficient number, since it is larger than the sum of its proper divisors (169842135).

381756393 is a wasteful number, since it uses less digits than its factorization.

381756393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13284 (or 13281 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 381756393 is about 19538.5872826057. The cubic root of 381756393 is about 725.4298793428.

The spelling of 381756393 in words is "three hundred eighty-one million, seven hundred fifty-six thousand, three hundred ninety-three".